[sledge] Move ctypes dep from lib to bin

Summary: The only code that uses Ctypes is in bin/frontend.ml

Reviewed By: ngorogiannis

Differential Revision: D20373139

fbshipit-source-id: 0edfdf2b1

sledge/bin/dune

@@ -6,9 +6,9 @@
 (executable
  (public_name sledge)
  (package sledge)
- (libraries dune-build-info llvm llvm.irreader llvm.analysis llvm.scalar_opts
+ (libraries ctypes ctypes.foreign dune-build-info llvm llvm.irreader
-   llvm.target llvm.ipo llvm.linker shexp.process yojson trace import
+   llvm.analysis llvm.scalar_opts llvm.target llvm.ipo llvm.linker
-   sledgelib model)
+   shexp.process yojson trace import sledgelib model)
  (flags
   (:standard -open Import -open Sledgelib -open Model))
  (preprocess

sledge/lib/dune

@@ -5,7 +5,7 @@
 
 (library
  (name sledgelib)
- (libraries apron apron.boxMPQ ctypes ctypes.foreign trace import)
+ (libraries apron apron.boxMPQ trace import)
  (flags
   (:standard -open Import))
  (preprocess